Author Topic: ZVS long cable freq stabilization  (Read 158 times)

Offline kreasteve

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ZVS long cable freq stabilization
« on: June 20, 2021, 02:56:13 AM »
Hi all, I'm new here and to high voltage.

I wanted to build a weed killer. By the way it already exists: https://zasso.com/

Take a look on my picture. (Test with external 24V/400W supply)

I bought a ZVS from Austria with a flyback transformer, improved the heat stability and built some parts around it, included two 1.5m long 40kV unshielded cables. The building process isn't finished: Safety circuits, frontpanel and a few other things are in development.

The problem is, that the generated frequency (normally 15kHz as you might expect) turns to 75kHz if both long cables are connected. I think there is some capacitive coupling over the ground. Can I somehow stabilize the freqency?

Other things I want to say:
-The three parallel SMPS are not the best way to produce ripple free voltage. But they are laying around.
-I should have started with highvoltage earlier. Its very interesting as I notices during the tests. A tesla coil is on my ToDo list.


Tanks in advance!

Best
Steven

Offline T3sl4co1l

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Re: ZVS long cable freq stabilization
« Reply #1 on: June 24, 2021, 04:22:34 PM »
Try more capacitance across the primary?  Idunno, it's a dumb oscillator (if it's the usual simple circuit), it can do whatever it wants, and transformers are complex networks with many characteristic frequencies.

Tim

Offline kreasteve

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Re: ZVS long cable freq stabilization
« Reply #2 on: June 24, 2021, 05:02:17 PM »
Hi Tim,

thanks for your reply!

Yes the frequency of the ZVS depends on the load.
I had allready tried double the capacity.

I'm going to build an H-Bridge on my own to enforce the frequency I want.

Steven

High Voltage Forum

Re: ZVS long cable freq stabilization
« Reply #2 on: June 24, 2021, 05:02:17 PM »

 


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